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Mr Smith was a super-computer owned by Sarah Jane Smith who also served as one of her faithful allies. He was located in the attic of Sarah Jane's house at 13 Bannerman Road. It was revealed that he was actually a Xylok embedded into the computer. For a brief period of time, he was Sarah Jane's enemy, working with a family of Slitheens to destroy Earth. (TV: The Lost Boy)

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The computer known as Mr Smith housed a sentient and highly intelligent crystal known as a Xylok. In the distant past a Xylok ship had crashed into the Earth, trapping the Xyloks in the crust of the planet. When the volcanoKrakatoa erupted, one crystal escaped. Centuries later, Sarah Jane Smith retrieved the living crystal, took it to her home on 13 Bannerman Road, and found it could communicate with her via her laptop. The crystal informed her how to build the computer to house the living crystal. Sarah Jane did not know at this time about the Xyloks or that Mr Smith planned to free the other Xyloks, even at the cost of the planet itself. (TV: The Lost Boy)

After she created the computer to house him, Mr Smith helped Sarah Jane, and offered her knowledge on many things. His help at this point however, was mainly confined to hacking other computers and displaying information on alien life forms. He momentarily revealed his dark side to Clyde Langer, presumably because he realised he might get help from the Slitheen. (TV:Revenge of the Slitheen)

Eventually, Mr Smith was able to team up with members of the Slitheen family on Earth. He helped two of them pose as Luke Smith's true parents so that they could kidnap him. Alan Jackson used a computer virus against Mr Smith which disabled him and wiped his database. As a result, Mr Smith forgot his purpose and asked for instructions. Sarah Jane informed him that his mission was to save humanity, which he accepted and fulfilled thereafter. (TV: The Lost Boy)

After his reprogramming, Mr Smith was of great help to Sarah Jane and Luke during the first part of the Dalek invasion of Earth in the 21st century. He alerted the Smith family to the Earth's changed position in space. He detected the presence of incoming space ships, and relayed the message of them to the Smiths. Once the fleet had been identified as Dalek in origin, he amplified an incoming sub-wave message from Harriet Jones. This message allowed a pivotal conference call between Sarah Jane, Martha Jones and Torchwood Three. They formulated a plan of action to contact the missing Tenth Doctor, in the hope that he could help repel the Daleks.

In this scheme, Mr Smith vitally linked together all the world's phone networks to dial the number of Martha Jones' phone aboard the TARDIS. Mr Smith's efforts were relayed to Torchwood, whose rift manipulator greatly amplified his signal. The power needed to amplify its phone call damaged the computer. Nevertheless, he was able to determine the site of the Doctor's TARDIS landing, prompting Sarah Jane to leave Luke in Mr Smith's care while she rendezvoused with the Time Lord. (TV: The Stolen Earth) Later, Mr Smith received the TARDIS base numerals from K9 and linked with the TARDIS and the Cardiff Rift, allowing the Doctor to tow the planet back to its proper place in space and time. (TV: Journey's End)

Mr Smith received a distress signal and video from a Judoon in a ship crashing to Earth. He told the gang where the ship was. Later on, Sarah Jane, possessed by Androvax, activated Mr Smith's self-destruct program, to destroy all of Bannerman Road in sixty seconds. Luke reminded Mr Smith that purpose was the most important thing to a Xylok and his purpose was to protect the Earth; Mr Smith's actions were against his purpose, so he stopped the countdown. (TV: Prisoner of the Judoon)

When the Slitheen-Blathereen gave Sarah Jane Rakweed, she had Mr Smith to scan it. He found it harmless, but the morning after, the weed mutated and attacked Luke. When the spores threatened him and Sarah Jane, Mr Smith used his cooling air vents to suck them away. Mr Smith monitored Luke's condition during the crisis. When Clyde, Rani and K9 discovered how to stop the Rakweed, K9 sent Mr Smith the frequency level required to sound the alarm bell sound across London (1421.09 Hertz). He did this again when the two Blathereen attacked, causing the Rakweed in their stomachs to be destroyed, creating a build-up of methane gas which caused them to explode all over everyone, including Mr Smith. (TV: The Gift)

When the Nightmare Man put Luke into a deep sleep, Mr Smith used a USB cable to give K9 extra power to contact Luke. He was attacked and damaged by the Nightmare Man, but later recovered. Before K9 left to accompany Luke to university, Mr Smith told him that he could contact him if needed, which K9 took to mean Mr Smith would miss him. (TV: The Nightmare Man)

When Androvax returned, Mr Smith trapped him in the containment vortex. (TV: The Vault of Secrets) When the Automatons removed all the humans from Earth except Clyde and Rani to look for the heir to the throne of their planet, Mr Smith was taken as well, leaving the computer an empty shell. He was returned when the Automatons found the heir. (TV: The Empty Planet) When Sarah Jane was secretly under attack by Ruby White, she asked Mr Smith to clear her voice from the command alphas. He still warned Clyde that Ruby was dangerous but was shut down by her, having fallen under the control of Mr White. After K9 reset Mr White, Mr Smith was restored and temporarily contained Ruby in a containment vortex before her escape. He later had Sarah Jane's voice restored to the command alphas and finally admitted K9 wasn't so bad. (TV: Goodbye, Sarah Jane Smith)

He was initially frightened of Sky Smith because of her tendency to blow up electrical devices such as him. (TV: Sky) As he was not human, he was unaffected by Hetocumtek's curse, helping Sky Smith work out what had happened. After he had helped Sky work out how to break the curse on Sarah and Clyde, he teleported the totem pole into the attic, where Clyde destroyed it, lifting the curse. (TV: The Curse of Clyde Langer)

Mr Smith was pleased that K9 did not accompany Luke when he returned from university. He told Sarah Jane the real Joseph Serf had died in a skiing accident in 2007 and analysed a SerfBoard with Clyde and Rani. They found out that it was a simple, low standard laptop. Luke used K9's whistle to speak to Mr Smith in Morse code, alerting Clyde and Rani to get the pen John Harrison was using to torture the Skullions. Luke and Sky took control of Serf whilst Sarah Jane and Adriana took the Skullions to the roof of the building. Mr Smith had alerted the Skullion species to send a spaceship to Earth to pick up the Skullions. (TV: The Man Who Never Was)

Mr Smith could also readily detect celestial bodies and ships in close proximity to the Earth, such as the other 26 planetary bodies and the Dalek fleet located in the Medusa Cascade. (TV: Journey's End)

Mr Smith also had a self destruct setting which was capable of destroying the whole of Bannerman Road. This was activated by the Veil Androvax when he possessed Sarah Jane's body. When Clyde, Rani, Luke and Captain Tybo found traces of Androvax in Sarah Jane's House, Mr Smith warned them to leave as soon as possible as the house would blow up in 60 seconds. (TV: Prisoner of the Judoon)

He could pick up transmissions on all frequencies including K9's command frequency over great distance even when coming from just a dog whistle. (TV: The Man Who Never Was)

He could make replicas and duplicates of things such as the a replica black diamond of Earnfield. The museum staff did not realise the difference between the replica and the original. (AUDIO: The Time Capsule)

Initially, Mr Smith comported himself with a cold, clinical mindset, more like an actual computer than a living being. When his true intentions were revealed, he acted maliciously and cruelly, becoming extremely ruthless and megalomaniacal, yet justified his actions by stating they were part of his "purpose". As such, Mr Smith was sociopathically logical and had no complaints about mass-murder or causing people who were thought to be his friends immense pain and suffering. He was even capable of a sadistic laugh, in spite of the fact that he was meant to be a computer, showing that he was actually a living being in crystalline, later electric, form. (TV: The Lost Boy)

After his memory had been wiped by the Armageddon Virus, (TV: The Lost Boy) Mr Smith's personality changed greatly. He became much friendlier and more amiable. He would make jokes. He bade Maria a fond farewell when she left for America. (TV: The Last Sontaran)

He showed great compassion for Sarah Jane's younger friends, especially her son Luke. He vowed to protect him from the Daleks (TV: The Stolen Earth) and did everything he could to save him from the Rakweed. (TV: The Gift), He also showed great concern for Sarah Jane after her heart was broken by Peter Dalton and the Trickster. (TV: The Wedding of Sarah Jane Smith) It is heavily implied that an unresolved romantic tension exists between Mr Smith and Sarah Jane throughout the series, which is simply unaided by a drastic contrast in species.

When K9 returned to Bannerman Road, Mr Smith entered into a deep rivalry with him, the two constantly trying to one-up each other in the technical support, and referring to each other as "the dog" and "that computer". (TV: The Wedding of Sarah Jane Smith et al) However, when it appeared K9 was broken, Mr Smith refrained from calling him a dog and even expressed concern. Before K9 left with Luke for Oxford University, Mr Smith told K9 that he could call him if needed, which K9 took to mean he would miss him. Mr Smith didn't deny it, just telling K9 goodbye. (TV: The Nightmare Man) However when around others he still maintained his animosity for "the dog" though after K9 saved him from Mr White he finally called K9 by name and admitted he wasn't so bad, saying he'd met worse. K9 returned the sentiment. (TV: Sarah Jane's Alien Files episode 3, Sarah Jane's Alien Files episode 4). (TV: Goodbye, Sarah Jane Smith) Despite this, he was still pleased when K9 didn't return with Luke from Oxford, showing there was still a rivalry between the two supercomputers. (TV: The Man Who Never Was)

He originally feared Sky due to her shorting out the power, but he got over it. (TV: Sky)

Despite his intelligence, Mr Smith could be literal-minded, such as when he gave Sky Smith information about the general details of school life while skipping over relatively minor information, so she thought that "toad-in-the-hole" actually had toad in it. (TV: The Curse of Clyde Langer)

It is not until Sarah Jane complains about it in The Stolen Earth that Mr Smith's fanfare is actually acknowledged as being something the characters hear, rather than incidental music for the viewer's benefit. The Wedding of Sarah Jane Smith establishes that it's possible to avoid the fanfare when Luke says he needs Mr Smith "quickly and quietly."

A possible reference to Mr Smith appears in the K9 story The Bounty Hunter. A news report in 2050 mentions that a "Mr Smith" won the National Lottery, but no one seems to know his first name or even who he is, and asks for Smith to step forward and accept his winnings.

The unproduced fourth story of series 5, Meet Mr Smith, would have featured Mr Smith becoming a human. It would later be revealed that this was due to an alien named Ozmo, who planned to use Mr Smith to capture Earth and its resources. (The Sarah Jane Companion Volume three)